Essential Question: Why is there a need to use ?

Learning Objectives: In this lesson, I will learn to...

• Write an equation using function notation, .

• Use f(x) to functions for different input values.

Function notation allows us to take an and find the using the function rule.

For example, f(5) = 2x + 1 means find the output of the function when x = 5.

So, f(5) = 2( ) + 1 =

Evaluate:

f(64) = ÷ 4 - 6

f(64) =

Evaluate:

f(12) = -10| |- 5

f(12) =

Evaluate:

f(9) = (2() + 11)^2

f(9) =

Evaluate:

f(22) = 8√(27+ )

f(22) =

Evaluate:

f(10.25) = 2.45√(5.75 + )

f(10.25) =

Evaluate:

f(-6.73) = (9.03 + ( ))^2

f(-6.73) =

One thing I must remember: the input is the value, and the output is the value where the graph is.

For example, as the graph shows, when the x value = , the y value =

Look at the graph.

Find f(4).

When x = , the y value of the graph is .

So, f(4) = .

The ordered pair is written as